The CSS Manassas was the first ironclad battleship in the American Civil War. It was used in the Battle of the Head of the Passes in 1861. The Confederacy followed suit by launching the CSS Virginia in 1862. The secessionists were at a disadvantage since European leaders confiscated ships that were built for the Confederacy.
Unfortunately, some wooden warships in the past were called "battleships." Therefore we'll presume you're referring to "metal" battleships built of iron or steel. The only metal battleships (other than iron plated wooden vessels) in the US Civil War were monitors. And monitors were actually riverine warships (or coastal which turned out to be stretching their limits quite a bit), not intended for the open sea; that's how the USS Monitor got sunk it tried to traverse the open sea and became flooded. Steel monitors were also used in the Vietnam War and they too were riverine craft.
the battleships usually sailed in the pacific ocean to guard the aircraft carriers
No.
The Germans started WW2 with 6 battleships. One, the Graf Spee was damaged and scuttled in the second month of war.
There were two , the Japanese battleships Yamato and Musashi which were the largest and most powerful of any battleships ever constructed .
They really didn't, for they were too bulky and big to be of much use. They were more of an experimental project, for they could not compare to the battleships made of wood that were much faster and more practical in a blockade.
With the exception of one ( USS Kearsarge, named after a civil war sloop-of-war, in turn named for a Mountain in New Hampshire) all United States Battleships where named after states.
Who invented the war machines, tanks, battleships, and crossbow?
Battleships as people know them today, all steel with rotating turrets and mounting heavy guns in calibers of 12 to 18 inches did not exist until the 1880s. The US Civil War was from 1861 until 1865.
No US battleships were sunk during the Viet Nam war.
the battleships usually sailed in the pacific ocean to guard the aircraft carriers
uss Mississippi
No.
The Germans started WW2 with 6 battleships. One, the Graf Spee was damaged and scuttled in the second month of war.
The Iowa class battleships.
About a year.
US battleships were named after states in the 1880's when the USN's first ALL STEEL battleships were built. Example: the battleship USS Maine was sunk in Havana Harbor in 1898.
Dreadnoughts.